Index: boost/test/floating_point_comparison.hpp
===================================================================
--- boost/test/floating_point_comparison.hpp	(revision 50345)
+++ boost/test/floating_point_comparison.hpp	(working copy)
@@ -205,7 +205,7 @@
     template<typename FPT, typename ToleranceBaseType>
     bool
     operator()( FPT left, FPT right, percent_tolerance_t<ToleranceBaseType> tolerance, 
-                floating_point_comparison_type fpc_type = FPC_STRONG )
+                floating_point_comparison_type fpc_type = FPC_STRONG ) const
     {
         close_at_tolerance<FPT> pred( tolerance, fpc_type );
 
@@ -214,7 +214,7 @@
     template<typename FPT, typename ToleranceBaseType>
     bool
     operator()( FPT left, FPT right, fraction_tolerance_t<ToleranceBaseType> tolerance, 
-                floating_point_comparison_type fpc_type = FPC_STRONG )
+                floating_point_comparison_type fpc_type = FPC_STRONG ) const
     {
         close_at_tolerance<FPT> pred( tolerance, fpc_type );
 
@@ -238,7 +238,7 @@
 
     template<typename FPT>
     bool
-    operator()( FPT fpv, FPT tolerance )
+    operator()( FPT fpv, FPT tolerance ) const
     {
         return tt_detail::fpt_abs( fpv ) < tt_detail::fpt_abs( tolerance );
     }